\(\color{darkblue}{\textbf{Layers}}\)
\(\color{dodgerblue}{\textbf{Cities from Space}}\)
\(\color{skyblue}{\textrm{- Night Lights}}\)
\(\color{skyblue}{\textrm{- Vegetation}}\)
| NAIP | Sentinel-2 | Landsat (1-9) |
|---|---|---|
 |
 |
 |
| Continental US | Global | Global |
| 2006, 2009, 2011, 2013, 2015, 2017, 2019 | 2016-present | 1999 - present |
| Yearly mosaic | Revisit time of 10 days (5 days from 2019) | Revisit time of 16 days |
| 1m resolution | 10m and 20m resolution | 30m resolution |
| 4 spectral bands (R, G, B, IR) | 13 spectral bands | 11 spectral bands |
\(\color{dodgerblue}{\textbf{Cities from the Sky}}\)
\(\color{dodgerblue}{\textbf{Cities from Rooftops}}\)
\(\color{dodgerblue}{\textbf{Cities from Streets}}\)
\(\color{dodgerblue}{\textbf{Cities and Citizens}}\)
\(\color{skyblue}{\textrm{- Population}}\)
The Gridded Population of the World, (GPWv4)
- Models the distribution of human population (counts and densities) on a continuous global raster surface
- Population input data were collected at the most detailed spatial resolution available from the results of the 2010 round of Population and Housing Censuses, which occurred between 2005 and 2014
- Year estimates available: 2000, 2005, 2010, 2015, 2020
| Observations | Count | Density |
|---|---|---|
 |
 |
 |
//Load data
var pop_collection = ee.ImageCollection("CIESIN/GPWv411/GPW_UNWPP-Adjusted_Population_Count")
.select('unwpp-adjusted_population_count');
//Choose date range
var T1_start = '2000-01-01';
var T1_ends = '2000-12-31';
var T2_start = '2020-01-01';
var T2_ends = '2020-12-31';
//Pull population for date range
var T1_pop = pop_collection.filterDate(T1_start, T1_ends).first();
var T2_pop = pop_collection.filterDate(T2_start, T2_ends).first();
//Calculate population change
var T2T1_pop_change = T2_pop.subtract(T1_pop);
//Plot
Map.setCenter(-74.0060, 40.7128, 9); //New York, United States
Map.addLayer(T1_pop, {min: 0, max: 2000, palette: [ 'ffffff', 'red' ]}, 'Population T1');
Map.addLayer(T2_pop, {min: 0, max: 2000, palette: [ 'ffffff', 'red' ]}, 'Population T2');
Map.addLayer(T2T1_pop_change, { min:-300, max: 300, palette: ['blue','black','red']}, 'Pop Change T1-T2');
\(\color{darkblue}{\textbf{Programs}}\)